Unfortunately this is all true. I have also been using Clion to program C++ on Linux for almost a decade and the past 5 years the product has been in a free fall.

- every new release breaks something

  - the syntax highlight and auto completion engine has glaring bugs when using multiple file splits.  Bugs are open for a decade already.

  - performance is complete dog shit. Typing a characters spins up several cores at 100%. 

  - QA plays the "test the bug on the latest and report back or it doesn't exist" game. 

Overall they seem to be more interested in shuffling the UI around and adding useless AI features nobody asked for while the core product is eroding fast. It really looks like they don't have tbe engineering capacity/talent to keep the product in shape and whatever capacity they have is misspent on wrong stuff.

Sorry but Clion is over.